Use the information in this article to determine which model of G4 you have; the only PowerMac G4 configurations which will accept an AirPort Extreme card are the FireWire 800 models. The regular AirPort card is not available from the Apple Store.

Your computer will take the regular AirPort card or a third-party wireless PCI card; at this point, it's probably easier and cheaper to find a third-party card. In addition, some third-party cards support the faster 802.11g protocol, which the original AirPort card does not; an AirPort card can be used with a network mixed between 802.11b and 802.11g devices. The AirPort Extreme card is not compatible with your machine.

Yours is the 2003 model - it's the only time they had a single 1.25 GHz. As such, as other have said, you would have to find a used AirPort card or buy a 3rd party one. For my own, I like the cleaner installation of the AirPort card, and it saves a PCI slot

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